Power optimization control of direct drive wave power system based on FFT

Aiming at the irregularity, disturbance and actual high-frequency ripple of the chattering and switching action in the control of the actual wave, the fast Fourier transform is used to analyze the wave excitation force. The maximum wave energy capture strategy is constructed by the vector superposition principle, and a direct drive wave power generation system model is established. The adaptive fast terminal sliding mode variable structure control method is used to achieve optimal power state tracking control, improve anti-interference and achieve time-limited convergence. At the same time, Kalman filter is used to filter ripple and reduce chattering, and Lyapunov function is used to analyze system stability. The simulation results show that the fast Fourier transform can meet the power optimal tracking requirements of unknown irregular waves. The proposed sliding mode control method can achieve fast tracking, accurate follow-up and strong robustness. © 2021, Solar Energy Periodical Office Co., Ltd. All right reserved.